package cn.zonhar.filter;

import cn.zonhar.common.core.R;
import com.alibaba.fastjson.JSON;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@Slf4j
@WebFilter(filterName = "LoginCheckFilter",urlPatterns = "/*")

public class LoginCheckFilter implements Filter {
    // 路径匹配器,支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        // 1.获取本次请求的url
        String requestUrl = request.getRequestURI();
        log.info("拦截到请求{}",requestUrl);
        // 定义不需要处理的请求路径
        String[] urls = new String[]{
                "/employee/login",
                "/employee/logout",
                "/backend/**",
                "/front/**"
        };
        // 2.判断本次请求是否需要处理
        boolean check = check(urls, requestUrl);
        // 3.如果不需要处理，则直接放行
        if (check) {
            log.info("本次请求{}不需要处理",requestUrl);
            filterChain.doFilter(request, response);
            return;
        }
        // 4.判断登录状态，如果已登录则放行
        if (request.getSession().getAttribute("employee")!=null) {
            log.info("用户以登录,用户id为{}",request.getSession().getAttribute("employee"));
            filterChain.doFilter(request, response);
            return;
        }
        log.info("用户未登录");
        // 5.如果未登录则返回未登录的结果,通过输出六方式向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
 
    }
 
    /**
     * 路径匹配，检测本次请求是否需要放行
     * @param urls
     * @param requestURI
     * @return
     */
    public boolean check(String[] urls,String requestURI) {
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);
            if (match){
                return true;
            }
        }
        return false;
 
    }
 
}